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Mr. ForsyTHE. Thank you, Dr. Pindzola. 
I thank both of you. 
Mr. Evans. Not often do we get three Republicans to zero Demo- 
crats in this committee or anywhere else. 
Dr. Bowen, Dr. Pindzola, Dr. Bennett, welcome. 
Let me congratulate you on what you have attempted to do in 
terms of developing an alternative to ocean dumping of sewage 
sludge, harmful dumping that is inexpensive and practical and en- 
vironmentally sound. 
You state that contaminants such as toxic metals are locked up 
in ECOROCK. Could you elaborate on that point for just a 
moment? What happens to those toxic metals when ECOROCK is 
used as a road surfacing material and as it’s worn down, do the 
toxics run off into our water base? I am a little concerned. 
Mr. PinpzoLa. Well, a road consists of about 92 percent rock en- 
cased in asphalt or Portland cement. The surface projections which 
protrude and which give a skid-resistance is a very minor part of 
the total amount of rock. Now only a small amount of wear occurs. 
This rock has been in place in a highway in Harrisburg, Pa., for 6 
years; very little wear has occurred. That is why the skid numbers 
also remain high with this material. However, the small amount of 
rock that wears off, be it .01 percent or something, would, in a city 
where the rock is intended for use, get washed back to the sewers 
and be recycled back into the ECOROCK process. 
In the countryside, the rock is not soluble, consequently if parti- 
cles of it broke off from the surface of the road it would not dis- 
solve in a thousand years. 
Mr. EvANs. So there would be no problem with runoff? 
Mr. PinDzoLa. No. 
Mr. Evans. You know you cited statistics, Dr. Pindzola, showing 
that if Congress dropped sludge disposal costs to approximately $63 
for a unit handling 400 tons per day, just for the record, I’d like to 
note that Mayor Koch when he was here, the Mayor of New York 
City, stated that New York produces about 260 dry tons of sewage 
sludge per day. It seems to me that that’s well below 400 tons and 
New York could take advantage of this alternative. 
You also indicated that the city of Philadelphia had just indicat- 
ed to you that the cost of disposal in the deep sea was somewhere 
around $120 per ton, which was $30 per ton more than you thought 
it had been. 
I asked Mayor Koch if he would give me the cost of disposal of 
each dry ton and I am looking forward to hearing that from him. 
But it seems to me that from an economic standpoint, that if it cost 
$63 per ton to recycle, developing something that is reusable, that 
that’s a lot less than $90 per ton or $100 per ton or $120 per ton, 
and you really have killed two birds with one stone. 
You are able to dispose of something in an environmentally safe 
manner but you are also able to use it to recycle and you use it 
very effectively from an economic standpoint. 
I would just like to congratulate you very much indeed. I think 
you are on the right track. 
Is EPA doing anything to make municipalities aware of what you 
have, since it is in the public domain? 
